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GAS GROUPING
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GASES
ARE GROUPED ACCORDING TO THEIR
IGNITION AND EXPLOSIVE CHARACTERISTICS |
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GAS GROUP |
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REFERENCE
GAS |
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I |
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METHANE |
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IIA |
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PROPANE |
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IIB |
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ETHYLENE |
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IIC |
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ACETYLENE
HYDROGEN |
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EXPLOSIVE,FLAMMABILITY & IGNITION
DATA
OF REFERENCE GASSES |
GAS |
BOILING
POINTºC
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FLASH
POINTºC |
IGNITION
TEMPºC
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IGNITION ENERGY |
EXPLOSIVE LIMITS |
RELATIVE VAPOUR DENSITY |
GROUP |
LFL |
UFL |
Methane** |
-162 |
Gas |
537 |
280µJ |
4.4 |
17 |
0.55 |
I |
Propane |
-42 |
Gas |
470 |
180µJ |
1.7 |
10.9 |
1.56 |
IIA |
Ethylene |
-104 |
Gas |
425 |
60µJ |
2.3 |
36 |
0.97 |
IIB |
Acetylene* |
-83 |
Gas |
305 |
19µJ |
2.3 |
100 |
0.9 |
IIC |
Hydrogen |
-252 |
Gas |
560 |
19µJ |
4 |
77 |
0.07 |
IIC |
*Additional requirements
for Acetylene
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**The LFL and UFL for Methane in respect of coal mines is
5% and 15%
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